Published online Jul 28, 2016. doi: 10.3748/wjg.v22.i28.6547
Peer-review started: April 4, 2016
First decision: May 12, 2016
Revised: May 26, 2016
Accepted: June 28, 2016
Article in press: June 29, 2016
Published online: July 28, 2016
AIM: To assess the functional gastrointestinal disorders (FGID) prevalence in infants and toddlers.
METHODS: PubMed, EMBASE, and Scopus were searched for original articles from inception to February 2016. The literature search was made in accordance with Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA). For inclusion, each study had to report epidemiological data of FGID on children up to 4 years old and contain standardized outcome Rome II or III criteria. The overall quality of included epidemiological studies was evaluated in accordance to Loney’s proposal for prevalence studies of health literature. Two reviewers assessed each study for inclusion and extracted data. Discrepancies were reconciled through discussion.
RESULTS: It was identified a total of 101 articles through the databases and two through the manual search. A total of 28 articles fulfilled the eligibility criteria. After reading the full articles, 13 of them were included in the present review. Twelve studies were written in English and one in Chinese, and published between 2004 and 2015. Eight articles (61.5%) were performed in Europe, three (23.1%) in America and two (15.4%) in Asia. Sample size varied between 45 and 9660 subjects. Cross-sectional frequency was reported in majority of studies (k = 9) and four studies prospectively followed the subjects. 27.1% to 38% of participants have met any of Rome’s criteria for gastrointestinal syndromes, of those 20.8% presented two or more FGID. Infant regurgitation and functional constipation were the most common FGID, ranging from less than 1% to 25.9% and less than 1% to 31%, respectively. Most included studies were of moderate to poor data quality with respect to absence of confidential interval for prevalence rate and inadequate sampling methods.
CONCLUSION: The scarcity and heterogeneity of FGID data call for the necessity of well-designed epidemiological research in different levels of pediatric practice and refinement of diagnostic.
Core tip: Epidemiological studies on functional gastrointestinal disorders in infants and toddlers provide variable prevalence rates in both pediatric outpatient and inpatient practice. A number of investigations and reviews have been conducted using Rome’s criteria for functional disorders to depict the magnitude of the problem, however, few investigations have reported meaningful results with adequate methodology. The current literature review suggested higher impact of pediatric feeding and defecation problems that affect very young children, respectively infant regurgitation and functional constipation.